| /* |
| * This file is part of the coreboot project. |
| * |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; version 2 of the License. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| */ |
| |
| #include <arch/cpu.h> |
| #include <cpu/x86/msr.h> |
| #include <cpu/amd/mtrr.h> |
| |
| #include <device/pci_ops.h> |
| #include <device/device.h> |
| #include <device/pci.h> |
| |
| #include <cbmem.h> |
| |
| #include "ram_calc.h" |
| |
| static inline uint8_t is_fam15h(void) |
| { |
| uint8_t fam15h = 0; |
| uint32_t family; |
| |
| family = cpuid_eax(0x80000001); |
| family = ((family & 0xf00000) >> 16) | ((family & 0xf00) >> 8); |
| |
| if (family >= 0x6f) |
| /* Family 15h or later */ |
| fam15h = 1; |
| |
| return fam15h; |
| } |
| |
| uint64_t get_uma_memory_size(uint64_t topmem) |
| { |
| uint64_t uma_size = 0; |
| if (CONFIG(GFXUMA)) { |
| /* refer to UMA Size Consideration in 780 BDG. */ |
| if (topmem >= 0x40000000) /* 1GB and above system memory */ |
| uma_size = 0x10000000; /* 256M recommended UMA */ |
| |
| else if (topmem >= 0x20000000) /* 512M - 1023M system memory */ |
| uma_size = 0x8000000; /* 128M recommended UMA */ |
| |
| else if (topmem >= 0x10000000) /* 256M - 511M system memory */ |
| uma_size = 0x4000000; /* 64M recommended UMA */ |
| } |
| |
| return uma_size; |
| } |
| |
| uint64_t get_cc6_memory_size() |
| { |
| uint8_t enable_cc6; |
| |
| uint64_t cc6_size = 0; |
| |
| if (is_fam15h()) { |
| enable_cc6 = 0; |
| |
| #if ENV_PCI_SIMPLE_DEVICE |
| if (pci_read_config32(PCI_DEV(0, 0x18, 2), 0x118) & (0x1 << 18)) |
| enable_cc6 = 1; |
| #else |
| struct device *dct_dev = pcidev_on_root(0x18, 2); |
| if (pci_read_config32(dct_dev, 0x118) & (0x1 << 18)) |
| enable_cc6 = 1; |
| #endif |
| |
| if (enable_cc6) { |
| /* Preserve the maximum possible CC6 save region |
| * This needs to be kept in sync with |
| * amdfam10_domain_read_resources() in northbridge.c |
| */ |
| cc6_size = 0x8000000; |
| } |
| } |
| |
| return cc6_size; |
| } |
| |
| void *cbmem_top(void) |
| { |
| uint32_t topmem = rdmsr(TOP_MEM).lo; |
| |
| return (void *) topmem - get_uma_memory_size(topmem) - get_cc6_memory_size(); |
| } |